This is the workflow I intend to stick with for a while. The foreground tree is a model, courtesy of the botaniq addon in Blender. Grass is a plane with grass generated by the realgrass addon. Background is an HDRI from HDRIHaven, downloaded at hi res.
Of course I do intend to do some modelling and not just use addons for everything. However I’ll be concentrating in the foreground and use HDRIs as much as possible for the rest, similar to matte painting in movies. I can create my own HDRIs from Vue if necessary, as well as shooting some of course. I do have a mirror ball after all.